gcc/config/rs6000/linux.h

   1 /* Definitions of target machine for GNU compiler,
   2    for IBM RS/6000 running AIX version 3.1.
   3    Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
   4    Contributed by Michael Meissner (meissner@cygnus.com).
   5
   6 This file is part of GNU CC.
   7
   8 GNU CC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2, or (at your option)
  11 any later version.
  12
  13 GNU CC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU CC; see the file COPYING.  If not, write to
  20 the Free Software Foundation, 59 Temple Place - Suite 330,
  21 Boston, MA 02111-1307, USA.  */
  22
  23 /* Don't assume anything about the header files. */
  24 #define NO_IMPLICIT_EXTERN_C
  25
  26 #undef MD_EXEC_PREFIX
  27 #undef MD_STARTFILE_PREFIX
  28
  29 #undef CPP_PREDEFINES
  30 #define CPP_PREDEFINES \
  31  "-DPPC -D__ELF__ -Dpowerpc -Acpu=powerpc -Amachine=powerpc"
  32
  33 #undef  CPP_OS_DEFAULT_SPEC
  34 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
  35
  36 #undef LINK_SHLIB_SPEC
  37 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
  38
  39 #undef  LIB_DEFAULT_SPEC
  40 #define LIB_DEFAULT_SPEC "%(lib_linux)"
  41
  42 #undef  STARTFILE_DEFAULT_SPEC
  43 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
  44
  45 #undef  ENDFILE_DEFAULT_SPEC
  46 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
  47
  48 #undef  LINK_START_DEFAULT_SPEC
  49 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
  50
  51 #undef  LINK_OS_DEFAULT_SPEC
  52 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
  53
  54 #undef TARGET_VERSION
  55 #define TARGET_VERSION fprintf (stderr, " (PowerPC GNU/Linux)");
  56
  57 /* Override rs6000.h definition.  */
  58 #undef ASM_APP_ON
  59 #define ASM_APP_ON "#APP\n"
  60
  61 /* Override rs6000.h definition.  */
  62 #undef ASM_APP_OFF
  63 #define ASM_APP_OFF "#NO_APP\n"
  64
  65 #undef DEFAULT_VTABLE_THUNKS
  66 #ifndef USE_GNULIBC_1
  67 #define DEFAULT_VTABLE_THUNKS 1
  68 #endif
  69
  70 /* Do code reading to identify a signal frame, and set the frame
  71    state data appropriately.  See unwind-dw2.c for the structs.  */
  72
  73 #ifdef IN_LIBGCC2
  74 #include <signal.h>
  75 #include <sys/ucontext.h>
  76 #endif
  77
  78 #define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS)               \
  79   do {                                                                  \
  80     unsigned char *pc_ = (CONTEXT)->ra;                                 \
  81     struct sigcontext *sc_;                                             \
  82     long new_cfa_;                                                      \
  83     int i_;                                                             \
  84                                                                         \
  85     /* li r0, 0x7777; sc  (rt_sigreturn)  */                            \
  86     /* li r0, 0x6666; sc  (sigreturn)  */                               \
  87     if (((*(unsigned int *) (pc_+0) == 0x38007777)                      \
  88          || (*(unsigned int *) (pc_+0) == 0x38006666))                  \
  89         && (*(unsigned int *) (pc_+4)  == 0x44000002))                  \
  90         sc_ = (CONTEXT)->cfa + __SIGNAL_FRAMESIZE;                      \
  91     else                                                                \
  92       break;                                                            \
  93                                                                         \
  94     new_cfa_ = sc_->regs->gpr[STACK_POINTER_REGNUM];                    \
  95     (FS)->cfa_how = CFA_REG_OFFSET;                                     \
  96     (FS)->cfa_reg = STACK_POINTER_REGNUM;                               \
  97     (FS)->cfa_offset = new_cfa_ - (long) (CONTEXT)->cfa;                \
  98                                                                         \
  99     for (i_ = 0; i_ < 32; i_++)                                         \
 100       if (i_ != STACK_POINTER_REGNUM)                                   \
 101         {                                                               \
 102           (FS)->regs.reg[i_].how = REG_SAVED_OFFSET;                    \
 103           (FS)->regs.reg[i_].loc.offset                                 \
 104             = (long)&(sc_->regs->gpr[i_]) - new_cfa_;                   \
 105         }                                                               \
 106                                                                         \
 107     (FS)->regs.reg[LINK_REGISTER_REGNUM].how = REG_SAVED_OFFSET;        \
 108     (FS)->regs.reg[LINK_REGISTER_REGNUM].loc.offset                     \
 109       = (long)&(sc_->regs->link) - new_cfa_;                            \
 110                                                                         \
 111     /* The unwinder expects the IP to point to the following insn,      \
 112        whereas the kernel returns the address of the actual             \
 113        faulting insn.  */                                               \
 114     sc_->regs->nip += 4;                                                \
 115     (FS)->regs.reg[CR0_REGNO].how = REG_SAVED_OFFSET;                   \
 116     (FS)->regs.reg[CR0_REGNO].loc.offset                                \
 117       = (long)&(sc_->regs->nip) - new_cfa_;                             \
 118     (FS)->retaddr_column = CR0_REGNO;                                   \
 119     goto SUCCESS;                                                       \
 120   } while (0)
 121